PORTLAND, Maine (PORTLAND PRESS HERALD) -- The new guns on the Navy’s biggest and most advanced destroyer are going to be firing blanks if the Navy can’t find cost-effective projectiles.

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The GPS-guided, rocket-powered projectiles developed for the new 155mm Advanced Gun System currently cost about $800,000 apiece, nearly as much as a cruise missile, making them too expensive for the Navy to buy in large quantities for the stealthy USS Zumwalt, according to officials.